mirror of https://git.meli.delivery/meli/meli
Async Cursors WIP
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/*
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* ____
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*
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* Copyright ____ Manos Pitsidianakis
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*
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* This file is part of ____.
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*
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* ____ is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* ____ is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with ____. If not, see <http://www.gnu.org/licenses/>.
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*/
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use super::*;
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#[derive(Debug)]
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pub struct ImapCursor {
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pub connection: Arc<FutureMutex<ImapConnection>>,
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pub mailbox_hash: MailboxHash,
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pub uid_store: Arc<UIDStore>,
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}
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impl crate::cursor::Cursor for ImapCursor {
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fn fetch(&self, start: usize, count: usize) -> Result<EnvelopeStream> {
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let connection = self.connection.clone();
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let mailbox_hash = self.mailbox_hash;
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let uid_store = self.uid_store.clone();
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Ok(Box::pin(async_stream::try_stream! {
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let mut response = Vec::with_capacity(8 * 1024);
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{
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let f = &uid_store.mailboxes.lock().await[&mailbox_hash];
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if f.no_select {
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yield vec![];
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return;
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}
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};
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loop {
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{
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let mut conn = connection.lock().await;
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conn.examine_mailbox(mailbox_hash, &mut response, false)
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.await?;
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conn.send_command_raw(b"UID SORT (REVERSE ARRIVAL) UTF-8 ALL").await?;
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conn.read_response(&mut response, RequiredResponses::empty())
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.await?;
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}
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yield vec![];
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return;
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}
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}))
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}
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fn total(&self) -> ResultFuture<Option<usize>> {
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Err(Error::new("Cursor not supported in this backend.").set_kind(ErrorKind::NotSupported))
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}
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fn unseen(&self) -> ResultFuture<Option<usize>> {
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Err(Error::new("Cursor not supported in this backend.").set_kind(ErrorKind::NotSupported))
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}
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fn has_updates(&self) -> ResultFuture<bool> {
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Err(Error::new("Cursor not supported in this backend.").set_kind(ErrorKind::NotSupported))
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}
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fn reset(&self) -> ResultFuture<()> {
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Err(Error::new("Cursor not supported in this backend.").set_kind(ErrorKind::NotSupported))
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}
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fn query(&self) -> Result<Arc<Query>> {
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Err(Error::new("Cursor not supported in this backend.").set_kind(ErrorKind::NotSupported))
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}
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}
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